Since the press in Poland wrote about this, I'll add a little context. According to the Muzeum Historii Ziemi Kamieńskiej's spokesperson, the knife is actually up to 3-2,8. They used the X-ray fluorescence method to come up with that number. The dating is being disputed, as it was rushed out after the discovery, and it's not like you can use carbon dating on metal. There's still chemical analysis to be done, but that doesn't give accurate results either. Some scientists point to the XVIII-XIX CE. Apparently some experts had a look at it and say it's from the Middle East, and if made of brass it could mean it's from I BCE, and it's been stylized to look ancient.
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